Abstract: This study lies within the scope of the valorisation of medicinal and aromatic plants of the Tunisian flora in the aim to find novel bioactive natural products. The essential oil constituents from the aerial part without flowers (stems and leaves), flowers and roots of Inula graveolens (L.) Desf., syn. Dittrichia graveolens (Desf.) Greuter, gathered in the area of Monastir (Tunisia) have been studied by GC-FID and GC-MS. Remarkable differences were found between the constituent percentages of the different studied organs. The most important compounds from the aerial part without flowers were τ-cadinol (9.2%), borneol (21.4%), bornyl acetate (33.4%). In the flowers oil, the main components found were Camphene (5.5%), τ-cadinol (11.3%), borneol (19.3%), bornyl acetate (39.6%). The major constituents in the oil roots were found to be carvone (5.0%), bornyl acetate (5.3%), p-mentha-1(7), 2-dien-8-ol (5.3%), β-selinene (11.5%) and a non identified compound (n°85, 22.2%). A comparison of these data with previous results reported in the literature showed surprising differences.